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Living with Human T-lymphotropic virus 1 infectious disease

A viral infection that can lead to blood cancer, nerve disease, eye inflammation, or skin problems in some people.

Understanding Human T-lymphotropic virus 1 infectious disease

Human T-lymphotropic virus 1 infectious disease is a viral infection that causes certain white blood cells (CD4 lymphocytes) to multiply more.

It is caused by the virus HTLV-1. Some infected people go on to develop a form of leukemia (blood cancer). Others develop a nerve condition of the spinal cord (myelopathy), eye inflammation (uveitis), skin inflammation (infectious dermatitis), or another inflammatory disorder.

Signs & symptoms

GARD doesn't list specific symptoms for this condition. Its summary describes:

  • Leukemia (blood cancer)
  • Spinal cord nerve disease (myelopathy)
  • Eye inflammation (uveitis)
  • Skin inflammation (dermatitis)
  • Other inflammatory disorders

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with rare disease patient organizations for support
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
What tests should I have to check for HTLV-1 health effects?
How can I lower the chance of passing it to others?
Which specialists should follow my care?

Quick facts

It is caused by the HTLV-1 virus. GARD says it is spread by sexual contact, by contaminated needles used for intravenous drugs, and by breast feeding.

Also known as: htlv 1 infection; htlv i infection; human t-cell lymphotropic virus (htlv) 1 infection; human t-cell lymphotropic virus 1 infection; human t-lymphotropic virus 1 caused disease or disorder; human t-lymphotropic virus 1 disease or disorder

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Human T-lymphotropic virus 1 infectious diseaseGARD ID 9645 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Human T-lymphotropic virus 1 infectious disease.

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Explore actively recruiting Human T-lymphotropic virus 1 infectious disease studies with HealthSpark.

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  • Recruiting studies from ClinicalTrials.gov
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  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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